AntiVir Divide By Zero Error in Processing UPX Packed Files Lets Remote Users Deny Service
SecurityTracker Alert ID: 1018132|
SecurityTracker URL: http://securitytracker.com/id/1018132
(Links to External Site)
Updated: May 12 2008|
Original Entry Date: May 29 2007
Denial of service via network|
Fix Available: Yes Vendor Confirmed: Yes |
Version(s): prior to 7.03.00.09|
A vulnerability was reported in AntiVir. A remote user can cause denial of service conditions.|
A remote user can create a specially crafted UPX-packed file that, when processed by the target user, will trigger a divide by zero error in the file parsing engine and crash the engine.
The vendor was notified on May 7, 2007.
Sergio Alvarez of n.runs AG discovered this vulnerability.
A remote user can create a file that, when processed by the target application, will cause the target application to crash.|
The vendor has issued a fixed version (7.03.00.09).|
The Avira advisory is available at:
Vendor URL: www.avira.com/ (Links to External Site)
|Underlying OS: Windows (Any)|
Source Message Contents
Subject: [Full-disclosure] n.runs-SA-2007.011 - Avira Antivir Antivirus UPX|
Vendor: Avira GmbH, http://www.avira.com
Affected Product: Avira Antivir Antivirus
Vulnerability: Divide by Zero Engine DoS (remote)
2007/05/07 initial notification to Avira GmbH
2007/05/07 Avira GmbH Response
2007/05/08 PGP public keys exchange
2007/05/09 PoC files sent to Avira GmbH
2007/05/10 Avira GmbH acknowledged and validated the PoC files
2007/05/16 Avira GmbH sent fix release schedule and fixed
2007/05/17 Sergio Alvarez tested fixed engine
2007/05/23 Avira GmbH released Update with fixes
Avira, a company with over 15 millions customers and more than 250 employees
is a worldwide leading supplier of self-developed security solutions for
professional and private use. With more than 20 years of experience, the
company is one of the pioneers in this field.
In addition to programs specifically for use on single workstations, Avira
primarily offers professional solutions for cross-system protection of
networks on various levels. These include products for workstations, file,
mail and web servers. Gateway computers can be managed as workstation
computers via a central management console for all operating systems. In
addition to the management products of the individual solutions, security
programs for PDAs, smartphones and embedded devices are also offered.
Avira AntiVir Personal, used by millions of private users, represents a
significant contribution to security.
A remotely exploitable vulnerability has been found in the file parsing
In detail, the following flaw was determined:
- Divide by Zero in UPX packed files parsing
This problem can lead to remote engine denial of service if an attacker
carefully crafts a file that exploits the aforementioned vulnerability. The
vulnerability is present in Avira Antivir Antivirus software versions prior
to the update Version 7.03.00.09.
The vulnerability was reported on 07.May.2007 and an update has been issued
on 23.May.2007 to solve this vulnerability through the regular update
Bugs found by Sergio Alvarez of n.runs AG.
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